ganglion csyst in wrong place..

i have a son 7 years old,past 2 mont i did noticed that he had lump at the right clavicle bone..its cause me awkward feeling and for specialist.after xray and CT SCAN procedures there claims as ganglion cyst..what im worry about is the doctor said it's quite rare to see ganglion cyst at clavicle bones..they want to make an observation within 2 month and try to see further.if it is dangerous thing i'll grow very fast..my question is are the doctors not really conform with the result and it's CT scan can exactly determine what it is..tq

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